Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/7503#issuecomment-123099497
I like @brkyvz 's idea about calling `scal` when `alpha == 0`. It would be
a noop when `beta == 0`, but handled by `scal`. Since this is a bug, I would
like to merge this first and have follow-up JIRAs to implement `scal`.
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